Remove CLANG_NO_IAS definition

CLANG_NO_IAS is not used anywhere in the tree.

Sponsored by:	The FreeBSD Foundation

share/mk/bsd.sys.mk

@@ -198,13 +198,6 @@ CWARNFLAGS+=	-Wno-unknown-pragmas
 # This warning is utter nonsense
 CFLAGS+=	-Wno-format-zero-length
 
-# We need this conditional because many places that use it
-# only enable it for some files with CLFAGS.$FILE+=${CLANG_NO_IAS}.
-# unconditionally, and can't easily use the CFLAGS.clang=
-# mechanism.
-.if ${COMPILER_TYPE} == "clang"
-CLANG_NO_IAS=	 -no-integrated-as
-.endif
 CLANG_OPT_SMALL= -mstack-alignment=8 -mllvm -inline-threshold=3\
 		 -mllvm -simplifycfg-dup-ret
 .if ${COMPILER_VERSION} >= 30500 && ${COMPILER_VERSION} < 30700

sys/conf/kern.mk

@@ -37,8 +37,6 @@ CWARNEXTRA+=	-Wno-error-shift-negative-value
 .if ${COMPILER_VERSION} >= 40000
 CWARNEXTRA+=	-Wno-address-of-packed-member
 .endif
-
-CLANG_NO_IAS= -no-integrated-as
 .endif
 
 .if ${COMPILER_TYPE} == "gcc"