[PATCH] D85074: [WebAssembly] Use "signed char" instead of "char" in SIMD intrinsics.

[Dan Gohman via Phabricator via cfe-commits]

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This allows people to use `int8_t` instead of `char`, -funsigned-char,
and generally decouples SIMD from the specialness of `char`.

And it makes intrinsics like `__builtin_wasm_add_saturate_s_i8x16`
and `__builtin_wasm_add_saturate_u_i8x16` use signed and unsigned
element types, respectively.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D85074

Files:
  clang/include/clang/Basic/BuiltinsWebAssembly.def
  clang/lib/Headers/wasm_simd128.h

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