Rolling r8 1.6.19 -> 1.6.22

We are rolling mainly to remove assertions, which was a bug in R8:
https://issuetracker.google.com/issues/139307059

Bug: 992809
Change-Id: Id7879e3ae72be7428f5c64a80d88969e18fa27fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1760462Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Commit-Queue: Sam Maier <smaier@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688251}

DEPS

@@ -1293,7 +1293,7 @@ deps = {
       'packages': [
           {
               'package': 'chromium/third_party/r8',
-              'version': '6mmxCrRGY15GNu1r-XmGVxohZfruF6_XjiKSCZakkN4C',
+              'version': 'PiWJNu1SdDl433fYwX_rFSX3zNZWizTfghShod_8QZ0C',
           },
       ],
       'condition': 'checkout_android',

third_party/r8/README.chromium

 Name: R8
 URL: https://r8.googlesource.com/r8
-Revision: 49dbca6424489d4320727bbd731175a310d7aa35
-Version: 1.6.19-dev
+Revision: c8785efaf448967838de4b1b6a0afea7d4ea5b74
+Version: 1.6.22-dev
 License: BSD 3-Clause
 License File: NOT_SHIPPED
 Security Critical: no

third_party/r8/local_modifications.diff

 diff --git a/src/main/java/com/android/tools/r8/utils/InternalOptions.java b/src/main/java/com/android/tools/r8/utils/InternalOptions.java
-index 7e788e156..959d31348 100644
+index 2b170ba8f..684d496eb 100644
 --- a/src/main/java/com/android/tools/r8/utils/InternalOptions.java
 +++ b/src/main/java/com/android/tools/r8/utils/InternalOptions.java
-@@ -168,8 +168,8 @@ public class InternalOptions {
+@@ -175,8 +175,8 @@ public class InternalOptions {
  
    // Optimization-related flags. These should conform to -dontoptimize and disableAllOptimizations.
    public boolean enableDynamicTypeOptimization = true;
@@ -13,7 +13,7 @@ index 7e788e156..959d31348 100644
    public boolean enableArgumentRemoval = true;
    public boolean enableUnusedArgumentRemoval = true;
    public boolean enableUnusedInterfaceRemoval = true;
-@@ -901,7 +901,7 @@ public class InternalOptions {
+@@ -941,7 +941,7 @@ public class InternalOptions {
      public static final String CLASS_NAME = "com.android.tools.r8.GeneratedOutlineSupport";
      public static final String METHOD_PREFIX = "outline";