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Isel had this forever, but the matching code for it in emit wasn't there
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With 59ca5a8db, querying if a symbol is defined is cheap. If we're
compiling code that calls foo() and we defined foo() in this compilation
unit, we already know its offset within the .text section, so use it
instead of emitting a relocation for the linker to handle. Also, put
small literal data in the .text section instead of .rodata. This seems
to improve performance (cache locality?), and as a bonus, it will be
good for aarch64's instr encoding with smallish PC-relative offsets.
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For `extern int x[1];`, can use PCREL32 for &x. But for `extern int
x(int)`, must use GOTREL, when not being called directly (that's PLT).
Therefore the type of an external symbol (actually just whether it
denotes a function) matters when deciding what kind of relocation to
emit, so keep that information.
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