Revert "Add some regression test cases for denormalized float8 input."

This reverts commit 500cf66d55.  As was
more or less expected, a small minority of platforms won't accept
denormalized input even with the recent changes.  It doesn't seem
especially helpful to test this if we're going to have to provide an
alternate expected-file to allow failure.

src/test/regress/expected/float8-exp-three-digits-win32.out

@@ -24,25 +24,6 @@ SELECT '-10e-400'::float8;
 ERROR:  "-10e-400" is out of range for type double precision
 LINE 1: SELECT '-10e-400'::float8;
                ^
--- test whether denormalized values are accepted
-SELECT '4.95e-324'::float8 < '1.49e-323'::float8;
- ?column? 
-----------
- t
-(1 row)
-
-SELECT '4.95e-324'::float8 > '0'::float8;
- ?column? 
-----------
- t
-(1 row)
-
-SELECT substr('-4.95e-324'::float8::text, 1, 4);
- substr 
---------
- -4.9
-(1 row)
-
 -- bad input
 INSERT INTO FLOAT8_TBL(f1) VALUES ('');
 ERROR:  invalid input syntax for type double precision: ""

src/test/regress/expected/float8-small-is-zero.out

@@ -24,25 +24,6 @@ SELECT '10e-400'::float8;
 
 SELECT '-10e-400'::float8;
  float8 
--- test whether denormalized values are accepted
-SELECT '4.95e-324'::float8 < '1.49e-323'::float8;
- ?column? 
-----------
- t
-(1 row)
-
-SELECT '4.95e-324'::float8 > '0'::float8;
- ?column? 
-----------
- t
-(1 row)
-
-SELECT substr('-4.95e-324'::float8::text, 1, 4);
- substr 
---------
- -4.9
-(1 row)
-
 --------
      -0
 (1 row)

src/test/regress/expected/float8-small-is-zero_1.out

@@ -24,25 +24,6 @@ SELECT '10e-400'::float8;
 
 SELECT '-10e-400'::float8;
  float8 
--- test whether denormalized values are accepted
-SELECT '4.95e-324'::float8 < '1.49e-323'::float8;
- ?column? 
-----------
- t
-(1 row)
-
-SELECT '4.95e-324'::float8 > '0'::float8;
- ?column? 
-----------
- t
-(1 row)
-
-SELECT substr('-4.95e-324'::float8::text, 1, 4);
- substr 
---------
- -4.9
-(1 row)
-
 --------
       0
 (1 row)

src/test/regress/expected/float8.out

@@ -24,25 +24,6 @@ SELECT '-10e-400'::float8;
 ERROR:  "-10e-400" is out of range for type double precision
 LINE 1: SELECT '-10e-400'::float8;
                ^
--- test whether denormalized values are accepted
-SELECT '4.95e-324'::float8 < '1.49e-323'::float8;
- ?column? 
-----------
- t
-(1 row)
-
-SELECT '4.95e-324'::float8 > '0'::float8;
- ?column? 
-----------
- t
-(1 row)
-
-SELECT substr('-4.95e-324'::float8::text, 1, 4);
- substr 
---------
- -4.9
-(1 row)
-
 -- bad input
 INSERT INTO FLOAT8_TBL(f1) VALUES ('');
 ERROR:  invalid input syntax for type double precision: ""

src/test/regress/sql/float8.sql

@@ -16,11 +16,6 @@ SELECT '-10e400'::float8;
 SELECT '10e-400'::float8;
 SELECT '-10e-400'::float8;
 
--- test whether denormalized values are accepted
-SELECT '4.95e-324'::float8 < '1.49e-323'::float8;
-SELECT '4.95e-324'::float8 > '0'::float8;
-SELECT substr('-4.95e-324'::float8::text, 1, 4);
-
 -- bad input
 INSERT INTO FLOAT8_TBL(f1) VALUES ('');
 INSERT INTO FLOAT8_TBL(f1) VALUES ('     ');