[X86] Add explicit library dependency on LLVMInstrumentation

Patch 9588b685 introduced dependency on ASAN. But it didn't
explicitly put LLVMInstrumentation as one of the library dependencies
such that the build will fail if we're building LLVM as shared libraries
(i.e. -DBUILD_SHARED_LIBS=ON).
This patch explicitly links X86CodeGen against the Instrumentation
component.

Differential Revision: https://reviews.llvm.org/D108662