Merge "Revert "Use implicit null checks inside try blocks.""

diff --cc compiler/optimizing/code_generator_arm.cc
Simple merge

diff --cc compiler/optimizing/code_generator_arm64.cc
Simple merge

diff --cc compiler/optimizing/code_generator_mips.cc
Simple merge

diff --cc compiler/optimizing/code_generator_x86.cc
Simple merge

diff --cc compiler/optimizing/code_generator_x86_64.cc
Simple merge

diff --cc runtime/arch/mips64/quick_entrypoints_mips64.S
Simple merge