[llvm-exegesis] Remove Assembler Tests

The Assembler tests have been disabled for years in tree and at this
point don't test anything other than common MC infrastructure that is
already tested in other parts of the tree. This patch removes them due
to the mentioned reasons.

Reviewed By: courbet

Differential Revision: https://reviews.llvm.org/D149819

Author: boomanaiden154

llvm/unittests/tools/llvm-exegesis/ARM/AssemblerTest.cpp

@@ -43,9 +43,6 @@ endfunction()
 if(LLVM_TARGETS_TO_BUILD MATCHES "X86")
   include(X86/CMakeLists.txt)
 endif()
-if(LLVM_TARGETS_TO_BUILD MATCHES "ARM")
-  include(ARM/CMakeLists.txt)
-endif()
 if(LLVM_TARGETS_TO_BUILD MATCHES "AArch64")
   include(AArch64/CMakeLists.txt)
 endif()

llvm/unittests/tools/llvm-exegesis/ARM/CMakeLists.txt

@@ -5,7 +5,6 @@ add_llvm_exegesis_unittest_includes(
   )
 
 add_llvm_exegesis_unittest_sources(
-  AssemblerTest.cpp
   BenchmarkResultTest.cpp
   RegisterAliasingTest.cpp
   SchedClassResolutionTest.cpp