Linter Infrastructure to support formatting the Compiler Component

[dsouzai]

See Proposal #22494.

Depends on eclipse-omr/omr#7939

---

The test linter can be found here. The PR build linter (currently disabled) is here.

1. Failed job example (triggered with the following patch)

diff --git a/runtime/compiler/exceptions/JITShutDown.hpp b/runtime/compiler/exceptions/JITShutDown.hpp
index 72681e459d..bd221861b1 100644
--- a/runtime/compiler/exceptions/JITShutDown.hpp
+++ b/runtime/compiler/exceptions/JITShutDown.hpp
@@ -30,7 +30,7 @@
 namespace J9 {

 /**
- * JIT Shutdown exception type.
+ *  JIT Shutdown exception type.
  *
  * Thrown to terminate a compile during the JIT Shutdown phase.
  */
diff --git a/runtime/vm/swalk.c b/runtime/vm/swalk.ca
index f29d5025de..86770a7bf8 100644
--- a/runtime/vm/swalk.c
+++ b/runtime/vm/swalk.c
@@ -88,7 +88,7 @@ static void getLocalsMap (J9StackWalkState * walkState, J9ROMClass * romClass, J
 static UDATA allocateCache (J9StackWalkState * walkState);
 static void dropToCurrentFrame (J9StackWalkState * walkState);

-/* The minimum number of stack slots that a stack frame can occupy */
+/*  The minimum number of stack slots that a stack frame can occupy */
 #define J9_STACKWALK_MIN_FRAME_SLOTS (OMR_MIN(sizeof(J9JITFrame), sizeof(J9SFStackFrame)) / sizeof(UDATA))

 static VMINLINE UDATA

2. Successful job example (no compiler files)
3. Successful job example (with compiler files)

These jobs use the .clang-format and Dockerfile from OMR. They also behave the same as the linter on OMR, namely the docker image is built every time, but remains cached on the machine; thus when run a second time, the job finishes much faster.

---

Similar to the OMR PR, I'll update this PR with the commits that actually format the code once we're ready to move forward.

[dsouzai]

@AdamBrousseau Does this look reasonable for what we would need to support a Code Format Linter on OpenJ9? Am I missing anything (aside from the actual job(s) on jenkins)?

[dsouzai]

@AdamBrousseau reminder ping.

[dsouzai]

@keithc-ca @mahdipub could you please review the infrastructure?

This is essentially a port of the OMR infrastructure; for context, see:

1. Format the Compiler Component eclipse-omr/omr#7846, specifically
   1. eclipse-omr/omr@3eedd83
   2. eclipse-omr/omr@9503ebc
   3. eclipse-omr/omr@05b8b27
   4. eclipse-omr/omr@109f9db
2. Update Clang Format Dockerfile to work with docker and rootless podman eclipse-omr/omr#7939