fix: Improve logging controls and robust integer literal generation

[kumarak]

This pull request improves logging configuration and fixes several robustness issues related to integer literal generation in AST operations.

Key changes include:

• Adding a glog-style minimum log level to suppress low-priority logs unless verbose mode is enabled.
• Updating the LOG macro and main.cpp to respect the configured verbosity level.
• Introducing make_int_literal_printable, a helper that safely creates printable integer literals for problematic types such as _Bool, char8_t, and enums.
• Updating integer literal creation sites in OperationStmt.cpp to use the new helper, preventing AST printer crashes and improving type handling consistency.

[kumarak]

@claude

[claude]

Claude finished @kumarak's task in 8m 3s —— View job

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PR Review — #280

• Check scope (6 C/C++ files in scope)
• Fetch PR diff
• Fetch PR head SHA (8f3a0ae)
• Read changed files at PR head
• Review each changed file
• Post inline findings (none)
• Deliver final verdict — approved

No blocking issues found. Reviewed Log.hpp, Utils.cpp/hpp, OperationStmt.cpp, BuildSNodeFromRegion.cpp, and main.cpp. Key points confirmed correct:

• LOG macro suppression: MinLogLevel() defaults to WARNING (2); FATAL (4) and ERROR (3) are never suppressed under any setting reachable via the CLI, preserving crash diagnostics.
• MakeIntLiteralPrintable: type-replacement path is entered only when printable() returns false; printable() is only called when operand_type is non-null (guarded by the integral check), so no null-dereference risk. Fallback to 32-bit int for 1-bit _Bool is correct — all call sites pass values 0 or 1 for bool discriminators. APInt isSigned has no effect on stored bits for widths ≤ 64, so sign semantics are unchanged.
• Enum lowering before literal creation: both OperationStmt.cpp and BuildSNodeFromRegion.cpp lower enum discriminator types to their underlying integer type before calling MakeIntLiteralPrintable, avoiding the getIntWidth-on-enum assertion path.
• disc_width removal: correctly eliminated because MakeIntLiteralPrintable internally calls ctx.getIntWidth(lit_type) after selecting the final type.

[claude]

No blocking issues found.