python: Explicitly add the 'L' suffix on Python 3

Python 2 had two integer types: int and long. Python 3 dropped the
latter, as it made the int type automatically support bigger numbers.

As a result, Python 3 lost the 'L' suffix on integer litterals.

This probably doesn't make much difference when compiling the generated
C code, but adding it explicitly means that both Python 2 and 3 generate
the exact same C code anyway, which makes it easier to compare and check
for discrepencies when moving to Python 3.

Signed-off-by: Mathieu Bridon <bochecha@daitauha.fr>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

src/compiler/nir/nir_algebraic.py

@@ -139,7 +139,16 @@ class Constant(Value):
       if isinstance(self.value, (int, long)):
          return hex(self.value)
       elif isinstance(self.value, float):
-         return hex(struct.unpack('Q', struct.pack('d', self.value))[0])
+         i = struct.unpack('Q', struct.pack('d', self.value))[0]
+         h = hex(i)
+
+         # On Python 2 this 'L' suffix is automatically added, but not on Python 3
+         # Adding it explicitly makes the generated file identical, regardless
+         # of the Python version running this script.
+         if h[-1] != 'L' and i > sys.maxsize:
+            h += 'L'
+
+         return h
       else:
          assert False