Do not specify intrinsic functions attributes

IIUC these attributes are known by LLVM anyway so there are no consequences
in not specifying them.

The reason for this change is that `argmemonly` is now replaced by `memory(argmem: readwrite)` and `readnone` by `memory(none)`

Author: mbouaziz

skiplang/prelude/preamble/preamble32.ll

@@ -10,13 +10,19 @@ declare ptr @SKIP_llvm_memcpy(ptr, ptr, i64)
 
 ; LLVM intrinsics
 
-declare void @llvm.lifetime.start(i64 immarg, ptr nocapture) argmemonly nounwind
-declare void @llvm.lifetime.end(i64 immarg, ptr nocapture) argmemonly nounwind
+; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
+declare void @llvm.lifetime.start(i64 immarg, ptr nocapture)
+; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
+declare void @llvm.lifetime.end(i64 immarg, ptr nocapture)
 
-declare i32 @llvm.eh.typeid.for(ptr) nounwind readnone
+; Function Attrs: nounwind readnone
+declare i32 @llvm.eh.typeid.for(ptr)
 
+; Function Attrs: nounwind readnone
 declare i64 @llvm.ctlz.i64(i64, i1)
+; Function Attrs: nounwind readnone
 declare i64 @llvm.cttz.i64(i64, i1)
+; Function Attrs: nounwind readnone
 declare i64 @llvm.ctpop.i64(i64)
 
 declare i32 @__gxx_personality_v0(...)

skiplang/prelude/preamble/preamble64.ll

@@ -9,13 +9,19 @@ declare ptr @SKIP_llvm_memcpy(ptr, ptr, i64)
 
 ; LLVM intrinsics
 
-declare void @llvm.lifetime.start(i64 immarg, ptr nocapture) argmemonly nounwind
-declare void @llvm.lifetime.end(i64 immarg, ptr nocapture) argmemonly nounwind
+; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
+declare void @llvm.lifetime.start(i64 immarg, ptr nocapture)
+; Function Attrs: mustprogress nocallback nofree nosync nounwind willreturn memory(argmem: readwrite)
+declare void @llvm.lifetime.end(i64 immarg, ptr nocapture)
 
-declare i32 @llvm.eh.typeid.for(ptr) nounwind readnone
+; Function Attrs: nounwind readnone
+declare i32 @llvm.eh.typeid.for(ptr)
 
+; Function Attrs: nounwind readnone
 declare i64 @llvm.ctlz.i64(i64, i1)
+; Function Attrs: nounwind readnone
 declare i64 @llvm.cttz.i64(i64, i1)
+; Function Attrs: nounwind readnone
 declare i64 @llvm.ctpop.i64(i64)
 
 declare i32 @__gxx_personality_v0(...)