SCons: Remove redundant -fomit-frame-pointer and -ftree-vectorize

- `-fomit-frame-pointer` is included automatically by both GCC and
  Clang in `-O1` and above.
- `-ftree-vectorize` is included automatically by GCC in `-O2` and
  beyond, and seems always enabled by Clang.

Closes #66296. See that issue for a detailed investigation.

(cherry picked from commit c5c3d13dc0)

platform/osx/detect.py

@@ -43,9 +43,9 @@ def configure(env):
 
     if env["target"] == "release":
         if env["optimize"] == "speed":  # optimize for speed (default)
-            env.Prepend(CCFLAGS=["-O3", "-fomit-frame-pointer", "-ftree-vectorize"])
+            env.Prepend(CCFLAGS=["-O3"])
         elif env["optimize"] == "size":  # optimize for size
-            env.Prepend(CCFLAGS=["-Os", "-ftree-vectorize"])
+            env.Prepend(CCFLAGS=["-Os"])
         if env["arch"] != "arm64":
             env.Prepend(CCFLAGS=["-msse2"])