Fix some C/C++ compiler warnings (#42348)

Author: fingolfin

src/cgutils.cpp

@@ -3593,7 +3593,7 @@ static Value *emit_defer_signal(jl_codectx_t &ctx)
     return ctx.builder.CreateInBoundsGEP(T_sigatomic, ptls, ArrayRef<Value*>(offset), "jl_defer_signal");
 }
 
-#ifndef NDEBUG
+#ifndef JL_NDEBUG
 static int compare_cgparams(const jl_cgparams_t *a, const jl_cgparams_t *b)
 {
     return

src/intrinsics.cpp

@@ -304,7 +304,9 @@ static Value *emit_unboxed_coercion(jl_codectx_t &ctx, Type *to, Value *unboxed)
         unboxed = emit_bitcast(ctx, unboxed, to);
     }
     else if (!ty->isIntOrPtrTy() && !ty->isFloatingPointTy()) {
+#ifndef JL_NDEBUG
         const DataLayout &DL = jl_data_layout;
+#endif
         assert(DL.getTypeSizeInBits(ty) == DL.getTypeSizeInBits(to));
         AllocaInst *cast = ctx.builder.CreateAlloca(ty);
         ctx.builder.CreateStore(unboxed, cast);

src/llvm-simdloop.cpp

@@ -239,7 +239,7 @@ PreservedAnalyses LowerSIMDLoop::run(Module &M, ModuleAnalysisManager &AM)
 
 namespace {
 class LowerSIMDLoopLegacy : public ModulePass {
-    LowerSIMDLoop Impl;
+    //LowerSIMDLoop Impl;
 
 public:
   static char ID;

src/signals-mach.c

@@ -594,7 +594,7 @@ void *mach_profile_listener(void *arg)
                 bt_data_prof[bt_size_cur++].uintptr = ptls->tid + 1;
 
                 // store task id
-                bt_data_prof[bt_size_cur++].uintptr = ptls->current_task;
+                bt_data_prof[bt_size_cur++].uintptr = (uintptr_t)ptls->current_task;
 
                 // store cpu cycle clock
                 bt_data_prof[bt_size_cur++].uintptr = cycleclock();