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Dominic Chen
aeeb84515c
Avoid accessing LLVM/DWARF register mappings if undefined
Summary: If the backend does not define LLVM/DWARF register mappings, the associated variables are undefined since the map initializer is called by auto-generated TableGen routines. This patch initializes the pointers and sizes to nullptr and zero, respectively, and checks that they are valid before searching for a mapping. Reviewers: grosbach, dschuff Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D23458 llvm-svn: 278574
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