Add strict version of modifySTRef
We added strict versions of modifyIORef and atomicModifyIORef recently (see #5926 (closed)), and STM has modifyTVar' since stm-2.3.
This patch adds modifySTRef', mostly copy-pasted from modifyIORef'. My ghc currently doesn't build, so I wasn't able to test it.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 7.4.2 |
| Type | FeatureRequest |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | libraries/base |
| Test case | |
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