Fix inline local declaration codegen

[gshaowei6]

Fixes #99.
Also fixes #97.

This updates BlockWriter to hoist primitive local declarations that javac exposes as first-write declarations inside inline assignment expressions.

Two paths are covered:

• if/else branches that declare the same source local now emit one outer declaration and suppress branch-local type prefixes, so chained assignments generate result = assignMe = value; instead of result = int assignMe = value;.
• inline assignments nested inside expression statements, such as method arguments, now emit the local declaration before the expression and then write the inline assignment as z=1, avoiding CodeGenException: we can't declare this int here.

Tests:

• RED check for [Bounty $20] Inline declarations throw exception. #97: after changing AssignAndPassAsParameterSimpleTest to expect successful OpenCL generation, it failed with CodeGenException: /* we can't declare this int here */ before the expression-level hoist.
• mvn "-Dtest=com.aparapi.codegen.test.AssignAndPassAsParameterSimpleTest" test (2 tests, 0 failures)
• mvn "-Dtest=com.aparapi.codegen.test.AssignAndPassAsParameterSimpleTest,com.aparapi.codegen.test.AssignAndPassAsParameterTest,com.aparapi.codegen.test.FirstAssignInExpressionTest,com.aparapi.codegen.test.FirstAssignInExpression2Test,com.aparapi.codegen.test.ConstantAssignInExpressionTest,com.aparapi.codegen.test.MultipleAssignExprTest,com.aparapi.codegen.test.MultipleAssignTest" test (14 tests, 0 failures)
• mvn "-Dtest=com.aparapi.codegen.test.*Test" test; the Docker run exited 0 and target/surefire-reports contains 434 tests, 0 failures, 0 errors, 2 skipped
• git diff --check