PPC: [no-wasm][flags] Remove wasm flags

Port 05265d88

Original Commit Message:

    This removes all wasm-related flags in no-wasm builds.
    We could have made them read-only, but fully removing them actually
    forces us to consider the no-wasm case at every use site, which often
    hints at further cleanups.

R=clemensb@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: Ib68968683023f602f2226f0fa8d7c26bcc04b170
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2814899Reviewed-by: Joran Siu <joransiu@ca.ibm.com>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Commit-Queue: Milad Fa <mfarazma@redhat.com>
Cr-Commit-Position: refs/heads/master@{#73864}

src/codegen/ppc/assembler-ppc.cc

@@ -55,7 +55,9 @@ static unsigned CpuFeaturesImpliedByCompiler() {
 }
 
 bool CpuFeatures::SupportsWasmSimd128() {
+#if V8_ENABLE_WEBASSEMBLY
   return CpuFeatures::IsSupported(SIMD);
+#endif  // V8_ENABLE_WEBASSEMBLY
 }
 
 void CpuFeatures::ProbeImpl(bool cross_compile) {