Default to -foptimize-nothrow for wasm targets too

CHANGELOG.md

@@ -2,7 +2,7 @@
 
 #### Big news
 - Frontend, druntime and Phobos are at version [2.113.0](https://dlang.org/changelog/2.113.0.html), incl. new command-line option `-foptimize-nothrow` to restore the `nothrow` optimizations. (#5113, #5221, #5239)
-  - `-foptimize-nothrow` is the default setting when targeting Windows, to make hitting https://github.com/ldc-developers/ldc/issues/3504 much less likely.
+  - `-foptimize-nothrow` is the default setting when targeting Windows or WebAssembly, to make hitting https://github.com/ldc-developers/ldc/issues/3504 much less likely.
 - Support for [LLVM 22](https://releases.llvm.org/22.1.0/docs/ReleaseNotes.html). The prebuilt packages use v22.1.8. (#5097, #5102, #5172)
 - Minimum LLVM version raised to 18. (#5094)
 - New prebuilt **addon packages** (`ldc2-*-addon-<target OS>.tar.xz`) for simple cross-compilation. Simply unpack them directly into your LDC installation directory, and then cross-compile via `-mtriple=…` (or `dub --target=…`): (#5240)

driver/cl_options.cpp

@@ -762,7 +762,7 @@ cl::opt<bool, true> fOptimizeNothrow(
     cl::location(global.params.nothrowOptimizations),
     cl::desc("Omit EH cleanups (destructors/`finally`/`scope(exit)`) when "
              "Errors unwind through nothrow code. Defaults to true for Windows "
-             "targets, to make hitting "
+             "and WebAssembly targets, to make hitting "
              "https://github.com/ldc-developers/ldc/issues/3504 less likely."));
 
 #if LDC_LLVM_SUPPORTED_TARGET_SPIRV || LDC_LLVM_SUPPORTED_TARGET_NVPTX || LDC_LLVM_SUPPORTED_TARGET_AArch64

driver/main.cpp

@@ -1262,8 +1262,8 @@ int cppmain() {
     global.params.dllimport = DLLImport::none;
   }
 
-  if (triple->isWindowsMSVCEnvironment() &&
-      opts::fOptimizeNothrow.getNumOccurrences() == 0) {
+  if (opts::fOptimizeNothrow.getNumOccurrences() == 0 &&
+      (triple->isWindowsMSVCEnvironment() || triple->isWasm())) {
     // FIXME: make https://github.com/ldc-developers/ldc/issues/3504 much less
     //        likely for now
     global.params.nothrowOptimizations = true;