IRGen: collocate WASM/ELF handling

WASM currently is treated identically to the ELF paths.  Collocate the
types to make it easier to ensure that all the paths are correctly
handling the emission.  This adds the missed case for the module hash.

Author: compnerd

lib/IRGen/GenDecl.cpp

@@ -905,12 +905,11 @@ std::string IRGenModule::GetObjCSectionName(StringRef Section,
                ? ("__DATA," + Section).str()
                : ("__DATA," + Section + "," + MachOAttributes).str();
   case llvm::Triple::ELF:
+  case llvm::Triple::Wasm:
     return Section.substr(2).str();
   case llvm::Triple::XCOFF:
   case llvm::Triple::COFF:
     return ("." + Section.substr(2) + "$B").str();
-  case llvm::Triple::Wasm:
-    return Section.substr(2).str();
   }
 
   llvm_unreachable("unexpected object file format");
@@ -937,12 +936,11 @@ void IRGenModule::SetCStringLiteralSection(llvm::GlobalVariable *GV,
       return;
     }
   case llvm::Triple::ELF:
+  case llvm::Triple::Wasm:
     return;
   case llvm::Triple::XCOFF:
   case llvm::Triple::COFF:
     return;
-  case llvm::Triple::Wasm:
-    return;
   }
 
   llvm_unreachable("unexpected object file format");

lib/IRGen/GenMeta.cpp

@@ -113,15 +113,13 @@ void IRGenModule::setTrueConstGlobal(llvm::GlobalVariable *var) {
     var->setSection("__TEXT,__const");
     break;
   case llvm::Triple::ELF:
+  case llvm::Triple::Wasm:
     var->setSection(".rodata");
     break;
   case llvm::Triple::XCOFF:
   case llvm::Triple::COFF:
     var->setSection(".rdata");
     break;
-  case llvm::Triple::Wasm:
-    var->setSection(".rodata");
-    break;
   }
 }
 

lib/IRGen/IRGenModule.cpp

@@ -1269,6 +1269,7 @@ bool IRGenModule::finalize() {
       ModuleHash->setSection("__LLVM,__swift_modhash");
       break;
     case llvm::Triple::ELF:
+    case llvm::Triple::Wasm:
       ModuleHash->setSection(".swift_modhash");
       break;
     case llvm::Triple::COFF: