[llvm][lit] Update regexes in Xunit test (#126527)

I got a report that downstream this test failed and the cause was that
it took longer than the 1 second we expected to run one of the test
cases.

This test doesn't need to be that specific, so I am updating all the
time regexes to be the same one that allows 0-9 any number of digits,
requires a decimal point, then 0-9 any number of digits for the final
part.

Author: DavidSpickett

tests/xunit-output.py

@@ -8,19 +8,19 @@
 # RUN: FileCheck < %t.xunit.xml %s
 
 # CHECK:      <?xml version="1.0" encoding="UTF-8"?>
-# CHECK-NEXT: <testsuites time="{{[0-9.]+}}">
-# CHECK-NEXT: <testsuite name="test-data" tests="5" failures="1" skipped="3" time="{{[0-9.]+}}">
-# CHECK-NEXT: <testcase classname="test-data.test-data" name="bad&amp;name.ini" time="{{[0-1]\.[0-9]+}}">
+# CHECK-NEXT: <testsuites time="{{[0-9]+\.[0-9]+}}">
+# CHECK-NEXT: <testsuite name="test-data" tests="5" failures="1" skipped="3" time="{{[0-9]+\.[0-9]+}}">
+# CHECK-NEXT: <testcase classname="test-data.test-data" name="bad&amp;name.ini" time="{{[0-9]+\.[0-9]+}}">
 # CHECK-NEXT:   <failure><![CDATA[& < > ]]]]><![CDATA[> &"]]></failure>
 # CHECK-NEXT: </testcase>
-# CHECK-NEXT: <testcase classname="test-data.test-data" name="excluded.ini" time="{{[0-1]\.[0-9]+}}">
+# CHECK-NEXT: <testcase classname="test-data.test-data" name="excluded.ini" time="{{[0-9]+\.[0-9]+}}">
 # CHECK-NEXT:   <skipped message="Test not selected (--filter, --max-tests)"/>
 # CHECK-NEXT: </testcase>
-# CHECK-NEXT: <testcase classname="test-data.test-data" name="missing_feature.ini" time="{{[0-1]\.[0-9]+}}">
+# CHECK-NEXT: <testcase classname="test-data.test-data" name="missing_feature.ini" time="{{[0-9]+\.[0-9]+}}">
 # CHECK-NEXT:   <skipped message="Missing required feature(s): dummy_feature"/>
 # CHECK-NEXT: </testcase>
-# CHECK-NEXT: <testcase classname="test-data.test-data" name="pass.ini" time="{{[0-1]\.[0-9]+}}"/>
-# CHECK-NEXT: <testcase classname="test-data.test-data" name="unsupported.ini" time="{{[0-1]\.[0-9]+}}">
+# CHECK-NEXT: <testcase classname="test-data.test-data" name="pass.ini" time="{{[0-9]+\.[0-9]+}}"/>
+# CHECK-NEXT: <testcase classname="test-data.test-data" name="unsupported.ini" time="{{[0-9]+\.[0-9]+}}">
 # CHECK-NEXT:   <skipped message="Unsupported configuration"/>
 # CHECK-NEXT: </testcase>
 # CHECK-NEXT: </testsuite>