Remove compiler flag to restore SNP build (#6779)

Author: eddyashton

.azure-pipelines-templates/build_check.yml

@@ -92,13 +92,6 @@ jobs:
           ninja -v | tee build.log
         shell: bash
 
-      - name: "Check Mitigation Flags"
-        run: |
-          cd build
-          python3 ../scripts/build-check.py < build.log SNPCC
-        shell: bash
-        if: ${{ matrix.platform.name == 'snp' }}
-
       - name: "Install Extended Testing Tools"
         run: |
           set -ex

.github/workflows/release.yml

@@ -75,11 +75,4 @@ function(add_warning_checks name)
   )
 endfunction()
 
-set(SPECTRE_MITIGATION_FLAGS -mllvm -x86-speculative-load-hardening)
-if("${COMPILE_TARGET}" STREQUAL "snp")
-  if(NOT "${CMAKE_BUILD_TYPE}" STREQUAL "Debug")
-    add_compile_options(${SPECTRE_MITIGATION_FLAGS})
-  endif()
-endif()
-
 set(CMAKE_CXX_STANDARD 20)