Optimize BIR by reusing temporary variables created for observability instrumentation

[gabilang]

Purpose

$title

Fixes #37506

Approach

Reuse possible temporary variables without creating new variables each time for observability instrumentation.

Samples

Remarks

Check List

• [x] Read the Contributing Guide
• [ ] Updated Change Log
• [ ] Checked Tooling Support (#<Issue Number>)
• [ ] Added necessary tests
  • [x] Unit Tests
  • [ ] Spec Conformance Tests
  • [ ] Integration Tests
  • [ ] Ballerina By Example Tests
• [ ] Increased Test Coverage
• [ ] Added necessary documentation
  • [ ] API documentation
  • [ ] Module documentation in Module.md files
  • [ ] Ballerina By Examples

[codecov[bot]]

Codecov Report

Base: 76.67% // Head: 76.68% // Increases project coverage by +0.00% :tada:

Coverage data is based on head (826c037) compared to base (8b9e0b9). Patch coverage: 91.21% of modified lines in pull request are covered.

:exclamation: Current head 826c037 differs from pull request most recent head 30d62bc. Consider uploading reports for the commit 30d62bc to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #37659   +/-   ##
=========================================
  Coverage     76.67%   76.68%           
- Complexity    53120    53145   +25     
=========================================
  Files          3355     3357    +2     
  Lines        199345   199429   +84     
  Branches      25874    25880    +6     
=========================================
+ Hits         152857   152935   +78     
- Misses        37818    37827    +9     
+ Partials       8670     8667    -3     

Impacted Files	Coverage Δ
...ompiler/bir/codegen/interop/ExternalMethodGen.java	33.70% <0.00%> (ø)
...g/compiler/bir/codegen/interop/JavaMethodCall.java	0.00% <0.00%> (ø)
...lang/compiler/bir/codegen/interop/JTerminator.java	40.00% <40.00%> (ø)
...inalang/compiler/bir/codegen/JvmTerminatorGen.java	84.43% <66.66%> (+0.14%)	:arrow_up:
...er/bir/codegen/interop/JMethodCallInstruction.java	75.00% <75.00%> (ø)
...nalang/compiler/bir/codegen/JvmInstructionGen.java	89.81% <85.00%> (-0.01%)	:arrow_down:
...lang/compiler/bir/codegen/JvmObservabilityGen.java	96.31% <100.00%> (-0.03%)	:arrow_down:
...ompiler/bir/codegen/interop/JIConstructorCall.java	50.00% <100.00%> (+10.00%)	:arrow_up:
...ang/compiler/bir/codegen/interop/JIMethodCall.java	50.00% <100.00%> (+10.00%)	:arrow_up:
...nalang/compiler/bir/codegen/interop/JTermKind.java	87.50% <100.00%> (+87.50%)	:arrow_up:
... and 16 more

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