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GH-115869: Make jit_stencils.h reproducible #127166

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@brandtbucher brandtbucher commented Nov 22, 2024

At the core dev sprint, we discussed the possibility of hosting pre-built jit_stencils.h files for common platforms and build configurations.

While there's a lot of work involved in making that happen (I'll post a rough plan shortly), this is the first logical step in that direction. This PR replaces absolute file paths in the generated code with relative ones, and processes stencils in sorted order.

@brandtbucher brandtbucher added build The build process and cross-build 3.14 new features, bugs and security fixes topic-JIT labels Nov 22, 2024
@brandtbucher brandtbucher self-assigned this Nov 22, 2024
@@ -202,7 +202,8 @@ def pad(self, alignment: int) -> None:
"""Pad the stencil to the given alignment."""
offset = len(self.body)
padding = -offset % alignment
self.disassembly.append(f"{offset:x}: {' '.join(['00'] * padding)}")
if padding:
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This is an unrelated cleanup.

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