Merge "regex: avoid a namespace collision with C23 <float.h>." into main am: 3211cac9a7

Original change: https://android-review.googlesource.com/c/platform/external/llvm/+/3428946

Change-Id: Ia6525d7a67bb3b896fd237426e80d09a27995ec5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>