Update git submodules

* Update prebuilts/clang/host/linux-x86 from branch 'master'
  to a9473dfc229ee3d7ce20ec1d4f37f3d3a3f0fa37
  - Update prebuilt Clang to r365631.
    
    clang 9.0.6 (based on r365631) from build 5821526.
    
    Bug: http://b/131328001
    Test: N/A
    Change-Id: I3895745f78da01fbe4b883c23a96723fa579ecf5
    
  - Remove clang-r365631 (build 5799447)
    
    Test: N/A
    Bug: 131328001
    Change-Id: I56934e4037b0f1832a3f6fbde9976620ef93aaad
    
1 file changed