target/hexagon: avoid invalid escape in Python string

This is an error in Python 3.12; fix it by using a raw string literal.

Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

target/hexagon/hex_common.py

@@ -45,7 +45,7 @@ def uniquify(seq):
 immre = re.compile(r"[#]([rRsSuUm])(\d+)(?:[:](\d+))?")
 reg_or_immre = re.compile(
     r"(((?<!DUP)[MNRCOPQXSGVZA])([stuvwxyzdefg]+)"
-    + "([.]?[LlHh]?)(\d+S?))|([#]([rRsSuUm])(\d+)[:]?(\d+)?)"
+    r"([.]?[LlHh]?)(\d+S?))|([#]([rRsSuUm])(\d+)[:]?(\d+)?)"
 )
 relimmre = re.compile(r"[#]([rR])(\d+)(?:[:](\d+))?")
 absimmre = re.compile(r"[#]([sSuUm])(\d+)(?:[:](\d+))?")
@@ -337,7 +337,7 @@ def read_attribs_file(name):
 
 
 def read_overrides_file(name):
-    overridere = re.compile("#define fGEN_TCG_([A-Za-z0-9_]+)\(.*")
+    overridere = re.compile(r"#define fGEN_TCG_([A-Za-z0-9_]+)\(.*")
     for line in open(name, "rt").readlines():
         if not overridere.match(line):
             continue