Revert "kbuild: Add support for Clang's polyhedral loop optimizer."

This reverts commit 2f5bb81, as we will
replace it with an implementation that checks for compiler support.

Signed-off-by: Diab Neiroukh <[email protected]>

Author: lzlrd

Makefile

@@ -722,14 +722,6 @@ KBUILD_CFLAGS	+= $(call cc-disable-warning,maybe-uninitialized,)
 endif
 endif
 
-ifdef CONFIG_POLLY_CLANG
-KBUILD_CFLAGS	+= -mllvm -polly \
-		   -mllvm -polly-vectorizer=stripmine
-ifdef CONFIG_LD_DEAD_CODE_DATA_ELIMINATION
-KBUILD_CFLAGS	+= -mllvm -polly-run-dce
-endif
-endif
-
 KBUILD_CFLAGS += $(call cc-ifversion, -lt, 0409, \
 			$(call cc-disable-warning,maybe-uninitialized,))
 

arch/Kconfig

@@ -587,17 +587,6 @@ config SHADOW_CALL_STACK_VMAP
 	  provides better stack exhaustion protection, but increases per-thread
 	  memory consumption as a full page is allocated for each shadow stack.
 
-config POLLY_CLANG
-        bool "Use clang Polly optimizations"
-        help
-	  This option enables Clang's polyhedral loop optimizer known as Polly.
-	  Polly is able to optimize various loops throughout the kernel for
-	  cache locality. This requires a Clang toolchain compiled with
-	  support for Polly. More information can be found from Polly's
-	  website:
-
-	    https://polly.llvm.org
-
 config HAVE_ARCH_WITHIN_STACK_FRAMES
 	bool
 	help