[KUDU-1783] Use binary bitcode format for precompiled LLVM IR

• Type: Improvement
• Status: Resolved
• Priority: Minor
• Resolution: Duplicate
• Fix Version/s: n/a
• Component/s: codegen
• Target Version/s: Backlog
• Assignee: Todd Lipcon
• Reporter: Todd Lipcon
• Created: 04/Dec/16 11:12
• Updated: 04/Dec/16 11:17
• Resolved: 04/Dec/16 11:17

Description

• instead of compiling with '-S', should compile with '-c'
• should use the extension '.bc' instead of '.ll' and update the variables accordingly
• change 'xxd' wrapper to use unsigned char instead of char

In a quick test, things still seem to work, and the resulting bitcode is about 25% the size (~300kb vs 1150KB). Seems like an easy win to shave a few MB off our packages and probably speed up IR parsing during codegen.