[PATCH] [PowerPC] Yet another approach to __tls_get_addr

[Bill Schmidt]

Revised to address Hal's comments.  I also had to add flags to the GETtls* instruction definitions to keep the aggressive anti-dependency breaker from touching the mentions of GPR3.

Committed as r227976.  Thanks for the review!

Bill


http://reviews.llvm.org/D7350

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