Bump clang version to 12 in GHA build matrix (#48977)

* Bump clang version to 12 in GHA build matrix

* Bump clang version to 10 in ClangBuildAnalyzer check

I am not sure if ClangBuildAnalyzer will function properly and
accurately with Clang 10 and above, because I see the following issue:

aras-p/ClangBuildAnalyzer#56

* Trigger ClangBuildAnalyzer on changes in CBA.yml itself

.github/workflows/CBA.yml

@@ -12,6 +12,7 @@ on:
     - '**/Makefile'
     - '**.hpp'
     - '**.cmake'
+    - '.github/workflows/CBA.yml'
   pull_request:
     branches:
     - master
@@ -23,6 +24,7 @@ on:
     - '**/Makefile'
     - '**.hpp'
     - '**.cmake'
+    - '.github/workflows/CBA.yml'
 
 
 jobs:
@@ -51,7 +53,7 @@ jobs:
     - name: make
       run: |
         ClangBuildAnalyzer --start .
-        CLANG=clang++-9 CXXFLAGS=-ftime-trace make 
+        CLANG=clang++-10 CXXFLAGS=-ftime-trace make
         ClangBuildAnalyzer --stop . buildAnalysis
     - name: Analyze
       run: ClangBuildAnalyzer --analyze buildAnalysis

.github/workflows/matrix.yml

@@ -58,13 +58,13 @@ jobs:
             sanitize: address
             native: linux64
             title: GCC 8, Ubuntu, Tiles, ASan
-          - compiler: clang++-9
+          - compiler: clang++-12
             os: ubuntu-latest
             cmake: 0
             tiles: 1
             sanitize: address,undefined
             native: linux64
-            title: Clang 9, Ubuntu, Tiles, ASan, UBSan
+            title: Clang 12, Ubuntu, Tiles, ASan, UBSan
           - compiler: clang++
             os: macos-10.15
             cmake: 0