Remove IFLAGS/FFLAGS types (#5406)

All instructions using the CPU flags types (IFLAGS/FFLAGS) were already
removed.  This patch completes the cleanup by removing all remaining
instructions that define values of CPU flags types, as well as the
types themselves.

Specifically, the following features are removed:
- The IFLAGS and FFLAGS types and the SpecialType category.
- Special handling of IFLAGS and FFLAGS in machinst/isle.rs and
  machinst/lower.rs.
- The ifcmp, ifcmp_imm, ffcmp, iadd_ifcin, iadd_ifcout, iadd_ifcarry,
  isub_ifbin, isub_ifbout, and isub_ifborrow instructions.
- The writes_cpu_flags instruction property.
- The flags verifier pass.
- Flags handling in the interpreter.

All of these features are currently unused; no functional change
intended by this patch.

This addresses https://github.com/bytecodealliance/wasmtime/issues/3249.

cranelift/filetests/filetests/isa/s390x/arithmetic.clif

@@ -231,107 +231,6 @@ block0(v0: i8, v1: i64):
 ;   ar %r2, %r3
 ;   br %r14
 
-function %iadd_i64(i64, i64) -> i64 {
-block0(v0: i64, v1: i64):
-  v2, v3 = iadd_ifcout.i64 v0, v1
-  return v2
-}
-
-; block0:
-;   algr %r2, %r3
-;   br %r14
-
-function %iadd_i64_ext32(i64, i32) -> i64 {
-block0(v0: i64, v1: i32):
-  v2 = uextend.i64 v1
-  v3, v4 = iadd_ifcout.i64 v0, v2
-  return v3
-}
-
-; block0:
-;   algfr %r2, %r3
-;   br %r14
-
-function %iadd_i64_imm32(i64) -> i64 {
-block0(v0: i64):
-  v1 = iconst.i64 32768
-  v2, v3 = iadd_ifcout.i64 v0, v1
-  return v2
-}
-
-; block0:
-;   algfi %r2, 32768
-;   br %r14
-
-function %iadd_i64_mem(i64, i64) -> i64 {
-block0(v0: i64, v1: i64):
-  v2 = load.i64 v1
-  v3, v4 = iadd_ifcout.i64 v0, v2
-  return v3
-}
-
-; block0:
-;   lg %r3, 0(%r3)
-;   algr %r2, %r3
-;   br %r14
-
-function %iadd_i64_mem_ext32(i64, i64) -> i64 {
-block0(v0: i64, v1: i64):
-  v2 = uload32.i64 v1
-  v3, v4 = iadd_ifcout.i64 v0, v2
-  return v3
-}
-
-; block0:
-;   llgf %r3, 0(%r3)
-;   algr %r2, %r3
-;   br %r14
-
-function %iadd_i32(i32, i32) -> i32 {
-block0(v0: i32, v1: i32):
-  v2, v3 = iadd_ifcout.i32 v0, v1
-  return v2
-}
-
-; block0:
-;   alr %r2, %r3
-;   br %r14
-
-function %iadd_i32_imm(i32) -> i32 {
-block0(v0: i32):
-  v1 = iconst.i32 32768
-  v2, v3 = iadd_ifcout.i32 v0, v1
-  return v2
-}
-
-; block0:
-;   alfi %r2, 32768
-;   br %r14
-
-function %iadd_i32_mem(i32, i64) -> i32 {
-block0(v0: i32, v1: i64):
-  v2 = load.i32 v1
-  v3, v4 = iadd_ifcout.i32 v0, v2
-  return v3
-}
-
-; block0:
-;   l %r3, 0(%r3)
-;   alr %r2, %r3
-;   br %r14
-
-function %iadd_i32_memoff(i32, i64) -> i32 {
-block0(v0: i32, v1: i64):
-  v2 = load.i32 v1+4096
-  v3, v4 = iadd_ifcout.i32 v0, v2
-  return v3
-}
-
-; block0:
-;   ly %r3, 4096(%r3)
-;   alr %r2, %r3
-;   br %r14
-
 function %isub_i128(i128, i128) -> i128 {
 block0(v0: i128, v1: i128):
   v2 = isub.i128 v0, v1

cranelift/filetests/filetests/isa/s390x/uadd_overflow_trap.clif

@@ -71,3 +71,14 @@ block0(v0: i64, v1: i64):
 ;   jle 6 ; trap
 ;   br %r14
 
+function %f5(i64, i32) -> i64 {
+block0(v0: i64, v1: i32):
+    v2 = uextend.i64 v1
+    v3 = uadd_overflow_trap v0, v2, user0
+    return v3
+}
+
+; block0:
+;   algfr %r2, %r3
+;   jle 6 ; trap
+;   br %r14