cranelift-isle: Rewrite error reporting (#5318)

There were several issues with ISLE's existing error reporting
implementation.

- When using Miette for more readable error reports, it would panic if
  errors were reported from multiple files in the same run.
- Miette is pretty heavy-weight for what we're doing, with a lot of
  dependencies.
- The `Error::Errors` enum variant led to normalization steps in many
  places, to avoid using that variant to represent a single error.

This commit:
- replaces Miette with codespan-reporting
- gets rid of a bunch of cargo-vet exemptions
- replaces the `Error::Errors` variant with a new `Errors` type
- removes source info from `Error` variants so they're easy to construct
- adds source info only when formatting `Errors`
- formats `Errors` with a custom `Debug` impl
- shares common code between ISLE's callers, islec and cranelift-codegen
- includes a source snippet even with fancy-errors disabled

I tried to make this a series of smaller commits but I couldn't find any
good split points; everything was too entangled with everything else.

Cargo.lock

@@ -443,6 +443,16 @@ dependencies = [
  "os_str_bytes",
 ]
 
+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
+
 [[package]]
 name = "component-fuzz-util"
 version = "0.0.0"
@@ -544,7 +554,6 @@ dependencies = [
  "gimli",
  "hashbrown",
  "log",
- "miette",
  "regalloc2",
  "serde",
  "sha2 0.10.2",
@@ -645,8 +654,8 @@ dependencies = [
 name = "cranelift-isle"
 version = "0.91.0"
 dependencies = [
+ "codespan-reporting",
  "log",
- "miette",
  "tempfile",
 ]
 
@@ -1534,12 +1543,6 @@ dependencies = [
  "windows-sys",
 ]
 
-[[package]]
-name = "is_ci"
-version = "1.1.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "616cde7c720bb2bb5824a224687d8f77bfd38922027f01d825cd7453be5099fb"
-
 [[package]]
 name = "isle-fuzz"
 version = "0.0.0"
@@ -1557,7 +1560,6 @@ dependencies = [
  "clap 3.2.8",
  "cranelift-isle",
  "env_logger 0.9.0",
- "miette",
 ]
 
 [[package]]
@@ -1763,37 +1765,6 @@ dependencies = [
  "autocfg 1.1.0",
 ]
 
-[[package]]
-name = "miette"
-version = "5.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6ec753a43fd71bb5f28751c9ec17fbe89d6d26ca8282d1e1f82f5ac3dbd5581e"
-dependencies = [
- "atty",
- "backtrace",
- "miette-derive",
- "once_cell",
- "owo-colors",
- "supports-color",
- "supports-hyperlinks",
- "supports-unicode",
- "terminal_size",
- "textwrap 0.15.0",
- "thiserror",
- "unicode-width",
-]
-
-[[package]]
-name = "miette-derive"
-version = "5.1.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "fdfc33ea15c5446600f91d319299dd40301614afff7143cdfa9bf4c09da3ca64"
-dependencies = [
- "proc-macro2",
- "quote",
- "syn",
-]
-
 [[package]]
 name = "miniz_oxide"
 version = "0.5.1"
@@ -2008,12 +1979,6 @@ version = "6.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8e22443d1643a904602595ba1cd8f7d896afe56d26712531c5ff73a15b2fbf64"
 
-[[package]]
-name = "owo-colors"
-version = "3.4.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "decf7381921fea4dcb2549c5667eda59b3ec297ab7e2b5fc33eac69d2e7da87b"
-
 [[package]]
 name = "p256"
 version = "0.9.0"
@@ -2681,12 +2646,6 @@ dependencies = [
  "serde",
 ]
 
-[[package]]
-name = "smawk"
-version = "0.3.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f67ad224767faa3c7d8b6d91985b78e70a1324408abcb1cfcc2be4c06bc06043"
-
 [[package]]
 name = "socket2"
 version = "0.4.4"
@@ -2751,34 +2710,6 @@ version = "2.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "6bdef32e8150c2a081110b42772ffe7d7c9032b606bc226c8260fd97e0976601"
 
-[[package]]
-name = "supports-color"
-version = "1.3.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "4872ced36b91d47bae8a214a683fe54e7078875b399dfa251df346c9b547d1f9"
-dependencies = [
- "atty",
- "is_ci",
-]
-
-[[package]]
-name = "supports-hyperlinks"
-version = "1.2.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "590b34f7c5f01ecc9d78dba4b3f445f31df750a67621cf31626f3b7441ce6406"
-dependencies = [
- "atty",
-]
-
-[[package]]
-name = "supports-unicode"
-version = "1.0.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8b945e45b417b125a8ec51f1b7df2f8df7920367700d1f98aedd21e5735f8b2"
-dependencies = [
- "atty",
-]
-
 [[package]]
 name = "symbolic_expressions"
 version = "5.0.3"
@@ -2896,11 +2827,6 @@ name = "textwrap"
 version = "0.15.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b1141d4d61095b28419e22cb0bbf02755f5e54e0526f97f1e3d1d160e60885fb"
-dependencies = [
- "smawk",
- "unicode-linebreak",
- "unicode-width",
-]
 
 [[package]]
 name = "thiserror"
@@ -3051,15 +2977,6 @@ version = "0.3.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "099b7128301d285f79ddd55b9a83d5e6b9e97c92e0ea0daebee7263e932de992"
 
-[[package]]
-name = "unicode-linebreak"
-version = "0.1.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3a52dcaab0c48d931f7cc8ef826fa51690a08e1ea55117ef26f89864f532383f"
-dependencies = [
- "regex",
-]
-
 [[package]]
 name = "unicode-normalization"
 version = "0.1.21"