[lldb] Fix Scalar::GetData for non-multiple-of-8-bits values (#90846)

It was aligning the byte size down. Now it aligns up. This manifested
itself as SBTypeStaticField::GetConstantValue returning a zero-sized
value for `bool` fields (because clang represents bool as a 1-bit
value).

I've changed the code for float Scalars as well, although I'm not aware
of floating point values that are not multiples of 8 bits.

lldb/test/API/python_api/type/TestTypeList.py

@@ -52,6 +52,19 @@ class TypeAndTypeListTestCase(TestBase):
         self.DebugSBValue(value)
         self.assertEqual(value.GetValueAsSigned(), 47)
 
+        static_constexpr_bool_field = task_type.GetStaticFieldWithName(
+            "static_constexpr_bool_field"
+        )
+        self.assertTrue(static_constexpr_bool_field)
+        self.assertEqual(
+            static_constexpr_bool_field.GetName(), "static_constexpr_bool_field"
+        )
+        self.assertEqual(static_constexpr_bool_field.GetType().GetName(), "const bool")
+
+        value = static_constexpr_bool_field.GetConstantValue(self.target())
+        self.DebugSBValue(value)
+        self.assertEqual(value.GetValueAsUnsigned(), 1)
+
         static_mutable_field = task_type.GetStaticFieldWithName("static_mutable_field")
         self.assertTrue(static_mutable_field)
         self.assertEqual(static_mutable_field.GetName(), "static_mutable_field")

lldb/test/API/python_api/type/main.cpp

@@ -28,6 +28,7 @@ public:
     union U {
     } u;
     static constexpr long static_constexpr_field = 47;
+    static constexpr bool static_constexpr_bool_field = true;
     static int static_mutable_field;
     Task(int i, Task *n):
         id(i),