For a single expression closure, just use the
expression as the body in the case where we're
coercing to Void, as the return is already
implied. This avoids crashing in
`ClosureExpr::getSingleExpressionBody` with a
double braced body.
Surprisingly it seems nothing is currently calling
`ClosureExpr::getSingleExpressionBody` after
type-checking, so no test case, but later commits
in this patch will exercise this case.
The `-force-single-frontend-invocation` flag predates WMO and is now an
alias for `-whole-module-optimization`. We should use the latter and let
the former fade into history.
This change PCMacro and PlaygroundTransform to return an a moduleID and
fileID in addition to the source location information. The Frontend has
been changed to run PCMacro and PlaygroundTransform on all input files
instead of the main file only.
The tests have been updated to conform to these changes with an addition
of module and file ID specific tests. The Playgrounds related tests were
adjusted to make a module out of the stub interface files since those
files should not have PCMacro and PlaygroundTransform applied to them.
rdar://problem/50821146
This converts the instances of the pattern for which we have a proper
substitution in lit. This will make it easier to replace it
appropriately with Windows equivalents.
