CL/aarch64: implement the wasm SIMD i32x4.dot_i16x8_s instruction

This patch implements, for aarch64, the following wasm SIMD extensions

  i32x4.dot_i16x8_s instruction
  https://github.com/WebAssembly/simd/pull/127

It also updates dependencies as follows, in order that the new instruction can
be parsed, decoded, etc:

  wat          to  1.0.27
  wast         to  26.0.1
  wasmparser   to  0.65.0
  wasmprinter  to  0.2.12

The changes are straightforward:

* new CLIF instruction `widening_pairwise_dot_product_s`

* translation from wasm into `widening_pairwise_dot_product_s`

* new AArch64 instructions `smull`, `smull2` (part of the `VecRRR` group)

* translation from `widening_pairwise_dot_product_s` to `smull ; smull2 ; addv`

There is no testcase in this commit, because that is a separate repo.  The
implementation has been tested, nevertheless.

crates/lightbeam/Cargo.toml

@@ -24,7 +24,7 @@ smallvec = "1.0.0"
 staticvec = "0.10"
 thiserror = "1.0.9"
 typemap = "0.3"
-wasmparser = "0.63.0"
+wasmparser = "0.65.0"
 
 [dev-dependencies]
 lazy_static = "1.2"

crates/lightbeam/wasmtime/Cargo.toml

@@ -13,6 +13,6 @@ edition = "2018"
 
 [dependencies]
 lightbeam = { path = "..", version = "0.20.0" }
-wasmparser = "0.63"
+wasmparser = "0.65"
 cranelift-codegen = { path = "../../../cranelift/codegen", version = "0.67.0" }
 wasmtime-environ = { path = "../../environ", version = "0.20.0" }