[lldb] Replace assertTrue(a == b, "msg") with assertEquals(a, b, "msg") in the test suite

Summary:
The error message from the construct `assertTrue(a == b, "msg") ` are nearly always completely useless for actually debugging the issue.
This patch is just replacing this construct (and similar ones like `assertTrue(a != b, ...)` with the proper call to assertEqual or assertNotEquals.

This patch was mostly written by a shell script with some manual verification afterwards:
```
lang=python
import sys

def sanitize_line(line):
  if line.strip().startswith("self.assertTrue(") and " == " in line:
    line = line.replace("self.assertTrue(", "self.assertEquals(")
    line = line.replace(" == ", ", ", 1)
  if line.strip().startswith("self.assertTrue(") and " != " in line:
    line = line.replace("self.assertTrue(", "self.assertNotEqual(")
    line = line.replace(" != ", ", ", 1)
  return line

for a in sys.argv[1:]:
  with open(a, "r") as f:
    lines = f.readlines()
  with open(a, "w") as f:
    for line in lines:
      f.write(sanitize_line(line))
```

Reviewers: labath, JDevlieghere

Reviewed By: labath

Subscribers: abidh, lldb-commits

Tags: #lldb

Differential Revision: https://reviews.llvm.org/D74475

lldb/test/API/functionalities/memory/cache/TestMemoryCache.py

@@ -48,7 +48,7 @@ class MemoryCacheTestCase(TestBase):
 
         # Check the value of my_ints[0] is the same as set in main.cpp.
         line = self.res.GetOutput().splitlines()[100]
-        self.assertTrue(0x00000042 == int(line.split(':')[1], 0))
+        self.assertEquals(0x00000042, int(line.split(':')[1], 0))
 
         # Change the value of my_ints[0] in memory.
         self.runCmd("memory write -s 4 `&my_ints` AA")
@@ -59,4 +59,4 @@ class MemoryCacheTestCase(TestBase):
 
         # Check the value of my_ints[0] have been updated correctly.
         line = self.res.GetOutput().splitlines()[100]
-        self.assertTrue(0x000000AA == int(line.split(':')[1], 0))
+        self.assertEquals(0x000000AA, int(line.split(':')[1], 0))