Revert "[Clang][Sema] placement new initializes typedef array with correct size (#88902)"

This reverts commit 5c6af60.

Breaks builds, see discussion in #83124

Author: metaflow

clang/test/SemaCXX/PR41441.cpp renamed to clang/test/SemaCXX/instantiate-new-placement-size.cpp

@@ -1,5 +1,5 @@
-// RUN: %clang --target=x86_64-pc-linux -S -fno-discard-value-names -emit-llvm -o - %s | FileCheck %s
-
+// RUN: %clang -S -fno-discard-value-names -emit-llvm -o - %s | FileCheck %s
+// Issue no: 41441
 #include <new>
 
 // CHECK: call void @llvm.memset.p0.i64(ptr align 1 %x, i8 0, i64 8, i1 false)