[OpenMPOpt] deduplicateRuntimeCalls(): avoid traditional map lookup pitfall
Summary:
This roughly halves time spent in that pass,
while unsurprisingly significantly reducing total memory usage.
This makes sense because most functions won't use any openmp functions..
old
```
0.2329 ( 0.5%) 0.0409 ( 0.9%) 0.2738 ( 0.5%) 0.2736 ( 0.5%) OpenMP specific optimizations
```
```
total runtime: 63.32s.
bytes allocated in total (ignoring deallocations): 8.34GB (131.70MB/s)
calls to allocation functions:
14526259 (229410/s)
temporary memory allocations: 3335760 (52680/s)
peak heap memory consumption: 324.36MB
peak RSS (including heaptrack overhead): 5.39GB
total memory leaked: 289.93MB
```
new
```
0.1457 ( 0.3%) 0.0276 ( 0.6%) 0.1732 ( 0.3%) 0.1731 ( 0.3%) OpenMP specific optimizations
```
```
total runtime: 55.01s.
bytes allocated in total (ignoring deallocations): 6.70GB (121.89MB/s)
calls to allocation functions:
14268205 (259398/s)
temporary memory allocations: 3225355 (58637/s)
peak heap memory consumption: 324.09MB
peak RSS (including heaptrack overhead): 5.39GB
total memory leaked: 289.87MB
```
diff
```
total runtime: -8.31s.
bytes allocated in total (ignoring deallocations): -1.63GB (196.58MB/s)
calls to allocation functions: -258054 (31034/s)
temporary memory allocations: -110405 (13277/s)
peak heap memory consumption: -262.36KB
peak RSS (including heaptrack overhead): 0B
total memory leaked: -61.45KB
```
Reviewers: jdoerfert, hfinkel
Reviewed By: jdoerfert
Subscribers: yaxunl, hiraditya, guansong, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D78299