[WebAssembly][NFC] Replace WASM with standard Wasm

[tlively]

Summary

The officially specified abbreviation for WebAssembly is Wasm and the
spec explicitly calls out WASM as being an incorrect spelling. This
patch fixes a few comments and error messages to use the
spec-compliant abbreviation.

[dschuff]

llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp

871

Is there any chance we can give more information here about which instruction or which feature is the offender?

[tlively]

llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp

871

Yep! https://reviews.llvm.org/D85795

llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp

 
 using namespace llvm;
 
 #define DEBUG_TYPE "wasm-asm-parser"
 
 namespace {
 
 /// WebAssemblyOperand - Instances of this class represent the operands in a
-/// parsed WASM machine instruction.
+/// parsed Wasm machine instruction.
 struct WebAssemblyOperand : public MCParsedAsmOperand {
   enum KindTy { Token, Integer, Float, Symbol, BrList } Kind;
 
   SMLoc StartLoc, EndLoc;
 
   struct TokOp {
     StringRef Tok;
   };
case Match_Success: {
         onEndOfFunction();
       } else {
         CurrentState = Instructions;
       }
       return false;
     }
     case Match_MissingFeature:
       return Parser.Error(
-          IDLoc, "instruction requires a WASM feature not currently enabled");
+          IDLoc, "instruction requires a Wasm feature not currently enabled");
     case Match_MnemonicFail:
       return Parser.Error(IDLoc, "invalid instruction");
     case Match_NearMisses:
       return Parser.Error(IDLoc, "ambiguous instruction");
     case Match_InvalidTiedOperand:
     case Match_InvalidOperand: {
       SMLoc ErrorLoc = IDLoc;
       if (ErrorInfo != ~0ULL) {

llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp

WebAssemblyTargetLowering::WebAssemblyTargetLowering(
   setMaxAtomicSizeInBitsSupported(64);
 
   // Override the __gnu_f2h_ieee/__gnu_h2f_ieee names so that the f32 name is
   // consistent with the f64 and f128 names.
   setLibcallName(RTLIB::FPEXT_F16_F32, "__extendhfsf2");
   setLibcallName(RTLIB::FPROUND_F32_F16, "__truncsfhf2");
 
   // Define the emscripten name for return address helper.
-  // TODO: when implementing other WASM backends, make this generic or only do
+  // TODO: when implementing other Wasm backends, make this generic or only do
   // this on emscripten depending on what they end up doing.
   setLibcallName(RTLIB::RETURN_ADDRESS, "emscripten_return_address");
 
   // Always convert switches to br_tables unless there is only one case, which
   // is equivalent to a simple branch. This reduces code size for wasm, and we
   // defer possible jump table optimizations to the VM.
   setMinimumJumpTableEntries(2);
 }