FrontendActions.cpp is currently one of the biggest compilation units in
all of flang. Measuring its compilation gives the following metrics:
User time (seconds): 139.21
System time (seconds): 4.65
Maximum resident set size (kbytes): 5891440 (5.61 GB)
This commit separates out explicit invocations of the parser into a
separate compilation unit - ParserActions.cpp - through helper functions
in order to decrease the maximum compilation time and memory usage of a
single unit.
After the split, the measurements of FrontendActions.cpp are as follows:
User time (seconds): 70.08
System time (seconds): 3.16
Maximum resident set size (kbytes): 3961492 (3.7 GB)
While the ones for the newly created ParserActions.cpp as follows:
User time (seconds): 104.33
System time (seconds): 3.37
Maximum resident set size (kbytes): 4185600 (3.99 GB)
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Signed-off-by: Kajetan Puchalski <kajetan.puchalski@arm.com>
