Turn off asan within LLVM code.
Turn off asan within LLVM code.

This commit turns off ASAN when precompiling LLVM functions. The LLVM
loader isn't able to resolve external ASAN symbols at runtime when loading
a precompiled libary, so it crashes hard. Now the the precompiled functions
don't have ASAN activated.

This is a bit of symptomatic resolution which costs us some safety within
codegenned functions, but it will do for now to let people use ASAN without
issues. This does not affect ASAN settings for the rest of the codegen
directory (or the rest of kudu).

Change-Id: I6237ebfe4b1a41cb16b6bcf45441847ef476d358
Reviewed-on: http://gerrit.sjc.cloudera.com:8080/4094
Reviewed-by: Adar Dembo <866ca730bfc7f544e3ebce604ceeba4879f23df0@cloudera.com>
Tested-by: jenkins
Reviewed-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@cloudera.com>

InspurUSA/kudu,cloudera/kudu,EvilMcJerkface/kudu,cloudera/kudu,InspurUSA/kudu,helifu/kudu,EvilMcJerkface/kudu,andrwng/kudu,andrwng/kudu,InspurUSA/kudu,cloudera/kudu,InspurUSA/kudu,cloudera/kudu,helifu/kudu,andrwng/kudu,helifu/kudu,helifu/kudu,andrwng/kudu,cloudera/kudu,EvilMcJerkface/kudu,InspurUSA/kudu,EvilMcJerkface/kudu,andrwng/kudu,InspurUSA/kudu,cloudera/kudu,helifu/kudu,helifu/kudu,cloudera/kudu,InspurUSA/kudu,andrwng/kudu,andrwng/kudu,EvilMcJerkface/kudu,EvilMcJerkface/kudu,EvilMcJerkface/kudu,EvilMcJerkface/kudu,InspurUSA/kudu,EvilMcJerkface/kudu,helifu/kudu,andrwng/kudu,andrwng/kudu,helifu/kudu,cloudera/kudu,helifu/kudu,cloudera/kudu,InspurUSA/kudu