[simd_ops] Build tests with -fpic

Since https://reviews.llvm.org/rG2047c10c22b0, the dso_local specifier
must be included in IR when building non-PIC code. The bitcode files in
this test suite do not have this, so will only work when all of the code
is built with -fpic.

The alternative to this would be to re-generate the bitcode with the
dso_local specifier where needed, but I don't know how this code was
generated in the first place, and don't want to modify the bitcode files
in-place if they might be later re-generated.

Differential revision: https://reviews.llvm.org/D94085
diff --git a/Bitcode/simd_ops/CMakeLists.txt b/Bitcode/simd_ops/CMakeLists.txt
index 24eaf26..0643440 100644
--- a/Bitcode/simd_ops/CMakeLists.txt
+++ b/Bitcode/simd_ops/CMakeLists.txt
@@ -25,4 +25,5 @@
     ${CMAKE_CURRENT_SOURCE_DIR}/${ARCH}_scalar_tests/scalar_${namebc}.bc
   )
   target_link_libraries(simd_ops_${namebc} simd_ops)
+  set_property(TARGET simd_ops_${namebc} PROPERTY POSITION_INDEPENDENT_CODE ON)
 endforeach()