K 10
svn:author
V 8
bdrewery
K 8
svn:date
V 27
2018-06-27T16:57:51.993630Z
K 7
svn:log
V 499
Add LLVM_TARGET_ALL option.

LLVM_TARGET_* will auto be set based on LLVM_TARGET_ALL and MK_CLANG.

If LLVM_TARGET_ALL is disabled, during a cross-build, then SYSTEM_COMPILER
and SYSTEM_LINKER are auto disabled.

This option should be used by users rather than the per-arch LLVM_TARGET
options as it is simpler to maintain for them should the supported
target list change.

MFC after:	2 weeks
Reviewed by:	sbruno, dim
Sponsored by:	Dell EMC
Differential Revision:	https://reviews.freebsd.org/D16020

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