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[CodeGen] Merge identical block descriptor global variables.

Description

[CodeGen] Merge identical block descriptor global variables.

Currently, clang generates a new block descriptor global variable for
each new block literal. This commit merges block descriptors that are
identical inside and across translation units using the same approach
taken in r339438.

To enable merging identical block descriptors, the size and signature of
the block and information about the captures are encoded into the name
of the block descriptor variable. Also, the block descriptor variable is
marked as linkonce_odr and unnamed_addr.

rdar://problem/42640703

Differential Revision: https://reviews.llvm.org/D50783

Details

Committed
ahatanakAug 17 2018, 8:46 AM
Differential Revision
D50783: [CodeGen] Merge identical block descriptor global variables
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